One-way brake for textile machinery



April 18, 1950 4 NQGUERA 2,504,571

ONE-WAY BRAKE FOR TEXTILE MACHINERY Filed NOV. 15, 1945 I 2 Sheets-Sheet 1 /5 444% m /0 /Z i y I I I a E i l 3 @k i A? I: /9 /7/9 a;

3 Invt 7' Jaw DZ JVoyaem UM NW April 13, 1950 J. NosuERA 2,504,571

' ONE-WAY BRAKE FOR TEXTILE MACHINERY Filed Nov. 13, 1945 2 Sheets-sheet 2 12 jag/24% //VVLW70l? 105m Mal/m1 A T TOBNE Y6 Patented Apr. 18, 1950 ONE-WAYBRAKE FOR TEXTILE MACHINERY Joseph Noguera, Manchester, England, assignor to Casablancas High Draft Company Limited, Manchester, England, a British company Application November 13, 1945, Serial No. 628,045 In Great Britain November 13, 1944 1 Claim. 1

This invention relates to the gearing associated with the drafting rollers of drafting mechanism for textile fibres.

Such gearing comprises a back roller wheel which is driven by the change draft pinion and it is well known that the torsional stress of the back bottom roller causes the back roller wheel to spring backwards when the change draft pinion is disengaged for the purpose of changing the gearing ratio or draft. Such backward movement of the back bottom roller causes an attenuation of the fibre strand which although it may not result in immediate rupture of the strand, frequently leads to such rupture in subsequent drafting stages.

Accordin to the present invention, the back roller wheel comprises an annular member concentrically and rotatably associated with the wheel, segmental members which are fixedly secured on each side of said annular member so as to form with said annular member channels which are divergent in the direction of rotation of the wheel, and spherical members which ride under gravity in said channels.

According to a modification, a single segmental member is fixedly secured between annular bear ing surfaces on the wheel so as to form said divergent channels.

While the wheel is rotating normally, the

spherical members ride freely in the channels and exert no braking effect on the wheel. Immediately the wheel tends to reverse however, the spherical members become wedged in the channels and exert a braking effect on the annular member associated with the wheel. It is noteworthy that substantially equal and opposite forces are applied to said annular member so that any eccentricity in the mounting of the wheel, or any play between the wheel shaft and its bearing, does not impede its effective braking.

One embodiment of the invention will now be described by way of example with reference to the accompanyin drawings, in which:

Figure 1 is an elevation of the wheel with half of the segment plate removed to expose the segments; Figure 2 is a section on the line A-A of Figure 1; Figure 3 is an elevation of another embodiment of the wheel with half the segment plate removed; Figure 4 is a section on the line 3-3 of Figure 3; and Figure 5 is a vertical section of a pin mounting as employed in accordance with the present invention.

The back roller wheel comprises a shell l0 having teeth It on its outer periphery, said shell being freely mounted on the driving shaft I2 which is supported in a carrier bracket lit. A driving plate I4 of hollow form is fixedly mounted on the drivin shaft I2 and is located within the shell ID to which it is secured by means of a screw 15. Said driving plate l4 terminates short of the inner periphery I6 of the shell and is formed with a peripheral flange I! which is channelled at I8 on either face to provide guiding surfaces for steel balls l9 as hereinafter ex-- plained. Segmental members 20 are attached to a segment plate 2| by means 01 screws 22,. the plate 2! being in turn attached to the carrier bracket l3, said segmental members 20 being disposed on each side of the peripheral flange IT on the driving plate in such manner that channels 23 are formed between said segmental members and the peripheral flange which are divergent in the direction of rotation of the wheel i. e. counter-clockwise. A steel ball I9 is located in each of said channels 23 and the balls are guided in said channels by engagement with the channels H8 in the peripheral flange. The segmental members 20 are made of hardened steel and by forming the back roller wheel with the driving plate as above described, it is possible to make the wheel shell of cast iron in. the usual way while making the driving plate with the peripheral bearing flange of steel.

Referring to Figures 3-5, the driving plate I4 extends substantially to the inner periphery [6 of the shell. A single segmental member 24 is secured to the segment plate 2| and is formed with curved surfaces 25 such that channels 23 are formed between member 24 and the flange l1 and the inner periphery 26 of the driving plate respectively, said channels being divergent in the direction of rotation of the wheel 1. e. counter-clockwise. Said curved surfaces 25 are channelled at 21 to form guiding surfaces for the balls l9. Pins 28 are secured to the segment plate 2|, as shown more particularly in Figure 5, to facilitate the assembly of the balls IS in the channels 23 and to act as retaining members therefor.

I claim:

In drafting mechanism of the character described, a shaft, a toothed roller wheel fast on said shaft, said toothed roller whee1 being recessed laterally, an annular flange within said recess concentric with said roller wheel and rotatable with said roller wheel, the depth of said flange being less than that of the recess, support means mounted on a fixed part of the drafting mechanism and lying within said recess, segmental means carried by said support means directions therein to perform a wedging action J on said annular flange if said roller wheel tends to reverse its direction of rotation.

JOSEPH NOGUERA.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Ryder Apr. 7, 1896 Loewy Aug. 3, 1926 Hathaway Oct. 4, 1927 Klemm Apr. 16, 1929 

